CN103880302A - Technique method for producing active lime - Google Patents
Technique method for producing active lime Download PDFInfo
- Publication number
- CN103880302A CN103880302A CN201410058693.XA CN201410058693A CN103880302A CN 103880302 A CN103880302 A CN 103880302A CN 201410058693 A CN201410058693 A CN 201410058693A CN 103880302 A CN103880302 A CN 103880302A
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- rotary kiln
- preheater
- kiln
- processing method
- quickened lime
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 24
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 24
- 239000004571 lime Substances 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title abstract description 22
- 238000001354 calcination Methods 0.000 claims abstract description 31
- 235000019738 Limestone Nutrition 0.000 claims abstract description 14
- 239000006028 limestone Substances 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000003672 processing method Methods 0.000 claims description 12
- 239000003034 coal gas Substances 0.000 claims description 8
- 239000011449 brick Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000013467 fragmentation Methods 0.000 claims description 3
- 238000006062 fragmentation reaction Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000010298 pulverizing process Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000005855 radiation Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 210000000038 chest Anatomy 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- XADCESSVHJOZHK-UHFFFAOYSA-N Meperidine Chemical compound C=1C=CC=CC=1C1(C(=O)OCC)CCN(C)CC1 XADCESSVHJOZHK-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000009885 systemic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
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- Furnace Details (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention relates to a technique method for producing active lime. The technique method comprises the following steps: firstly pulverizing raw material limestone, so as to enable the raw material not to enter a preheater in a blocky manner. In the follow-up primary calcination and curing calcinations stages, the traditional equipment and production technique are incomparable with the completely curing results generated by the continuous calcination procedures through the preheater, an external kiln splitter and a rotary kiln; furthermore, through an insulating layer structure and a protruding structure on the surface of an inner cavity of the rotary kiln, the insulating property of the rotary kiln is superior to the conventional technology, powder can be sufficiently stirred evenly through protrusions on the inner cavity of the rotary kiln in the production process of the rotary kiln, so that the optimization of the calcination effects can be improved.
Description
Technical field
The present invention relates to a kind of method of burning the technique means production Calcium of intensifiens such as rotary kiln by Vertical Mill, preheater, precalcining, gas, especially a kind of processing method of producing quickened lime.
Background technology
Active Lime Rotary Kiln system has that output is high, lime quality good and is stable, can calcine the advantage of the aspects such as granule level Wingdale.China's lime production industry has had wide variation, has introduced one after another the rotary kiln of German Crouse Ma Fei company, MIT, Metso Company of the U.S.; Two thorax shaft furnaces of Mai Erzi company of Switzerland, the sleeve kiln of former Beckenbach company of Germany, the twin beams kiln of Fu Kasi company of Italy and " beam bridge " sleeve kiln, and the suspension kiln of two " D " kilns of Italian Lyceum company, German Bai Li Hughes Electronics, the beam type kiln of Italian Fo Lida company, the coke kiln of SUMITOMO CHEMICAL company.In introducing, the rotary kiln of domestic-developed, two thorax shaft furnace, sleeve kiln, beam type kiln, Novel air burnt lime vertical kiln, Novel coke lime shaft kiln, middle stone shaft kiln, Ma Shi kiln are also extensively promoted.Below wherein, Crouse's luxuriant and rich with fragrance type of one agate (KMAG) of Germany and the tall and erect type of U.S.'s dolantin (KVS), these three kinds of kiln types of Mitsubishi Heavy Industries Ltd's band chain comb preheating machine of Japan and the limestone kiln of grate cooler (vertical wave you type) all belong to two grades or the third gear traditional structure rotary kiln that the length-to-diameter ratio (L/D) of predecomposition is 11～15, the predecomposition rate of Wingdale is 20%～25%, maximum 30%, hear rate >=1100Kcal/kg.Ca0, optimum feed stock granularity is 15～45mm.But it is large that its shortcoming is floor space, the high and low calorific value of gas utilization ratio of hear rate is low, and this has affected the application of rotary kiln lime system to a certain extent.Especially entering after 21 century, along with the high speed development of national economy, it is that rotary kiln quickened lime production technical field is wanted the new problem that must solve that low-carbon environment-friendly, comprehensive utilization of resources, the tail gas that China's quickened lime production industry faces fully utilizes, reduces the problems such as construction investment.
Summary of the invention
Technical problem to be solved by this invention is that a kind of processing method of producing quickened lime is provided.And the problem that predecomposition rate is low, gas utilization rate is low, hear rate is high of Wingdale while solving production quickened lime with this method.
For this reason, the technical scheme that the present invention solves described problem is: a kind of processing method of producing quickened lime, comprises step:
(1) raw material limestone of diameter 300-400mm is sent into washing pool washing through conveyer;
(2) the clean work stone being obtained by step (1) is the rubble of diameter 8-10mm through hammer-crusher (400T/h) fragmentation;
(3) rubble input vertical mill step (2) being obtained grinds, sieve and make < 3mm to 200 object limestone powder and enter feed bin;
(4) powder step (3) being obtained by bag-type dust after through feed bin input height >=70m's and there is more than two or two preheater between calcining zone and carry out preheating;
(5) provide coal gas the powder from preheater is carried out to elementary calcining and in precalcining device, carry out decomposed by coal-gas producer splitter outside preheater kiln, Temperature Setting is at 300 ° of C-800 ° of C therebetween;
(6) be input to that kiln intracoelomic cavity has a 3-40mm thickness thermal insulation layer and kiln intracoelomic cavity wall refractory brick through the powder of destroyer breaks down and be provided with in protruding rotary kiln and carry out slaking calcining, Temperature Setting is at 850 ° of C-1150 ° of C therebetween;
(7) obtain quickened lime product by rotary kiln discharge hole for discharge.
Preferably, described preheater is at least two or more between its calcining zone having, and is shaped separately between each calcining zone, is mutually independent and interconnects by pipeline.
Preferably, in the fuel element being formed by preheater and precalcining device, be provided with two or two above combustion chambers;
Preferably, the internal chamber wall refractory brick of described rotary kiln is provided with protruding its and is shaped as waviness, trapezoidal or trilateral;
Preferably, the velocity of rotation of described rotary kiln is more than 2.5 revs/min or 2.5 revs/min;
Compared to existing technology, the positively effect that the present invention produces is: be first that raw material limestone is carried out to powdered processing, the raw material that will enter preheater is no longer occurred with the shape of piece stone; At follow-up elementary calcining, slaking calcination stage, the complete slaking result that the continuous calcining operation being made up of preheater, precalcining device, rotary kiln produces is that legacy equipment and production technique are incomparable; Moreover, the heat insulation layer structure on rotary kiln inner chamber body surface and bulge-structure make rotary kiln heat-insulating property be better than routine techniques, and the projection of its kiln intracoelomic cavity can make to expect that powder obtains fully all stirring in rotary kiln production process, thereby make to calcine the effect raising of optimization again.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the processing method of the production quickened lime (calcium oxide) that the present invention relates to.
Embodiment
Launching to be necessary to analyze before the embodiment of the present invention traditional calcined limestone technique in the past and even the problem existing now: Wingdale reaches 30 %, residue 70% decomposing and calcining in rotary kiln at the high energy of the predecomposition rate of traditional shaft preheater.Rotary kiln belongs to open type calciner, and Wingdale is constantly rolling in rotary kiln, be conducive to size granularity Wingdale and evenly calcine, but Wingdale and flue gas is taking radiation heat transfer as main, need>=1350
othe calcining temperature of C, because limestone kiln is protected without kliner coating, simplified surface temperature is up to 300
omore than C, the heat lost by radiation of cylindrical shell is about 150kcal/kgCa0, accounts for 13%～15% of system overall heat consumption.And preheater is taking convective heat exchange as main, though heat exchange area is large, to flue-gas temperature require relatively not high, therefore, the surface radiating of preheater and the thermosteresis of leakage loss be only ten of the simplified heat radiation of rotary kiln/-.
How to improve the predecomposition rate of Wingdale, concerning lumpy material: the one, improve predecomposition temperature, the 2nd, ensure enough warm up time.From the rotary system with shaft preheater, increase preheater height and just can ensure warm up time.There are two kinds of methods and improve predecomposition temperature: first method is to improve kiln exit gas temperature, so the necessary ability 1200 of associated components such as kiln tail charging chute, kiln quarter badge
othe above high temperature of C, and resistance to air loss to kiln tail sealing device and high thermal resistance propose higher requirement, to ensure its in use unlikely being burned.This method has increased manufacture difficulty and cost.Second method is to keep kiln exit gas temperature-resistant, and at preheater, place sets up Secondary Heat Source, as " kiln tail one is the fire " of new type nonaqueous cement system, to improve the thermo-efficiency of predecomposition temperature and exchange flue gas.The flue-gas temperature that Secondary Heat Source provides is 1200
oc left and right, lower than the calcining temperature in kiln, the coal gas that can use low calorie fuels (as blast furnace or coal gas of converter) and utilize producer gas generator to produce is more efficient, can significantly improve Wingdale predecomposition rate, reduce calcinating fuel amount in rotary kiln, shorten residence time of material, thereby make that rotary kiln specification is corresponding to be reduced, simplified surface heat radiating loss reduces greatly.
Consider the factors such as preheater bed of material resistance, waste gas outlet temperature, given enter the flue-gas temperature of preheater be between 1150～1200 DEG C, Wingdale residence time in preheater is 3.5～4 hours, suitably improve the preheating temperature in preheater, and ensure under the condition of enough warm up time, can increase substantially the predecomposition rate of Wingdale in preheater.
So far,, referring to Fig. 1, the enforcement of its step of processing method of the said production quickened lime of the present invention (calcium oxide) has fully demonstrated feature of the present invention.For example, from Wingdale raw material, the step process of technique is:
(1) raw material limestone of diameter 300-400mm is sent into washing pool washing through conveyer;
(2) the clean work stone being obtained by step (1) is the rubble of diameter 8-10mm through hammer-crusher (400T/h) fragmentation;
(3) rubble input vertical mill step (2) being obtained grinds, sieve and make < 3mm to 200 object limestone powder and enter feed bin;
(4) powder step (3) being obtained by bag-type dust after through feed bin input height >=70m's and there is more than two or two preheater between calcining zone and carry out preheating;
(5) provide coal gas the powder from preheater is carried out to elementary calcining and in precalcining device, carry out decomposed by coal-gas producer to precalcining device, Temperature Setting is at 300 ° of C-800 ° of C therebetween;
(6) be input to that kiln intracoelomic cavity has a 3-40mm thickness thermal insulation layer and kiln intracoelomic cavity wall refractory brick through the powder of destroyer breaks down and be provided with in protruding rotary kiln and carry out slaking calcining, Temperature Setting is at 850 ° of C-1150 ° of C therebetween;
(7) obtain quickened lime product by rotary kiln discharge hole for discharge.
For burning quality, the present invention redesigns single storehouse shaft preheater and firing system, preheater is designed to secondary preheater or the above preheater of secondary, specifically, for the burning quality that promotes pulverulent lime stone, compared with the prior art, the present invention by the calcination space in preheater be designed to independently, be separately shaped and each other can be by the connected preheater of pipeline; In practice can by these independently calcination space be referred to as progression preheater, have what calcination space just can determine the quantity that this preheater comprises calcination space; In addition, according to calcining amount, the height dimension of shaft preheater also can be located limit for height, preferably can be made as height >=70m; Number of combustion chambers in fuel element between preheater and precalcining device can be made as more than two or two.Simultaneously, solving in rotary kiln rotating speed problem, the present invention has adopted friction gear, it is more than 2.5 revs/min or 2.5 revs/min that its velocity of rotation can be made as, so, even if for always the weigh rotary kiln of 75 tons of l000t/d limestone kiln, transmission mechanism, also be to greatly reduce the manufacture of rotary kiln and installation costs than legacy equipment the present invention, and maintenance cost can make kiln transmission surface of base can dwindle 1/4 ~ 1/2 simultaneously, greatly reduce the civilwork engineering quantity of kiln foundation pier, thereby reduced the integrated engineering cost of rotary kiln.
Consider the relation of systemic resistance, kiln end temperature and predecomposition rate in dynamic process and the process thereof of best calcining process parameter, rotary kiln actual production, the present invention is except redesigning preheater internal structure, the internal structure of rotary kiln has also been carried out to design again, for example, it is waviness, trapezoidal or trilateral that rotary kiln internal chamber wall refractory brick is provided with to convex design, and the thermal insulation layer on rotary kiln internal chamber wall is designed to the high aluminum fiber lagging material of thickness between 3-40mm.
Proved by above embodiment, according to the processing method of production quickened lime of the present invention, the technique level of traditional calcined limestone can be promoted greatly.More than the predecomposition rate of Wingdale can being brought up to 70 % by 30 %, simultaneously, utilize the present invention can make the evenly calcining in rotary kiln of different grain size Wingdale, and redesigning under the prerequisite of preheater, precalcining device, rotary kiln, rotary kiln device specification is reduced, reduce the simplified surface heat loss of kiln, thereby greatly reduced system hear rate.Under the outflow resistance of preheater waste gas and the substantially constant condition of temperature, make system hear rate by 1150kcal/kgCa0 below 950kcal/kgCa0.
Claims (5)
1. a processing method of producing quickened lime, comprises step:
(1) raw material limestone of diameter 300-400mm is sent into washing pool washing through conveyer;
(2) the clean work stone being obtained by step (1) is the rubble of diameter 8-10mm through hammer-crusher (400T/h) fragmentation;
(3) rubble input vertical mill step (2) being obtained grinds, sieve and make < 3mm to 200 object limestone powder and enter feed bin;
(4) powder step (3) being obtained by bag-type dust after through feed bin input height >=70m's and there is more than two or two preheater between calcining zone and carry out preheating;
(5) provide coal gas the powder from preheater is carried out to elementary calcining and in precalcining device, carry out decomposed by coal-gas producer to precalcining device, Temperature Setting is at 300 ° of C-800 ° of C therebetween;
(6) be input to that kiln intracoelomic cavity has a 3-40mm thickness thermal insulation layer and kiln intracoelomic cavity wall refractory brick through the powder of destroyer breaks down and be provided with in protruding rotary kiln and carry out slaking calcining, Temperature Setting is at 850 ° of C-1150 ° of C therebetween;
(7) obtain quickened lime product by rotary kiln discharge hole for discharge.
2. the processing method of production quickened lime according to claim 1, is characterized in that, between described preheater and precalcining device, is provided with more than two or two combustion chambers.
3. the processing method of production quickened lime according to claim 1, it is characterized in that, described preheater is at least two or more between its calcining zone having, and is shaped separately between each calcining zone, is mutually independent and interconnects by pipeline.
4. the processing method of production quickened lime according to claim 1, is characterized in that, the internal chamber wall refractory brick of described rotary kiln is provided with projection, and it is shaped as waviness, trapezoidal or trilateral.
5. the processing method of production quickened lime according to claim 1, is characterized in that, the velocity of rotation of described rotary kiln is more than 2.5 revs/min or 2.5 revs/min.
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| CN201410058693.XA CN103880302B (en) | 2014-02-21 | 2014-02-21 | A kind of processing method of producing quickened lime |
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| CN201410058693.XA CN103880302B (en) | 2014-02-21 | 2014-02-21 | A kind of processing method of producing quickened lime |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066606A (en) * | 2015-09-05 | 2015-11-18 | 吉首大学 | Waste heat drying rotary kiln |
| CN107055535A (en) * | 2017-04-20 | 2017-08-18 | 杜金厂 | A kind of powder calcium oxide and carbon dust decompose calcium carbide device and its technique |
| CN107619203A (en) * | 2017-09-28 | 2018-01-23 | 广西华洋矿源材料有限公司 | A kind of production method of active calcium oxide |
| CN108358471A (en) * | 2018-02-26 | 2018-08-03 | 山西太钢不锈钢股份有限公司 | A method of solving the ditch group lime stone explosion of horse man |
| CN108467211A (en) * | 2018-06-19 | 2018-08-31 | 郑小华 | A kind of active lime and its production technology |
| CN110639430A (en) * | 2019-10-15 | 2020-01-03 | 宁夏洪腾科技开发有限公司 | Recarburizer granulating system for comprehensively utilizing fine powder of calcined coal furnace |
| CN110976040A (en) * | 2019-12-04 | 2020-04-10 | 句容市星辰新型材料有限公司 | Environment-friendly limestone powder production process |
| CN113185152A (en) * | 2021-04-28 | 2021-07-30 | 浙江钙科机械设备有限公司 | High-quality calcium oxide grading suspension calcination production line and suspension calcination process thereof |
| CN114162822A (en) * | 2022-01-12 | 2022-03-11 | 米长山 | Process for producing calcium carbide |
| CN114315179A (en) * | 2021-12-20 | 2022-04-12 | 米长山 | Process for producing active lime |
| CN114804186A (en) * | 2022-05-16 | 2022-07-29 | 吴江市威士达铜业科技有限公司 | Production method and production device of copper oxide |
| CN115974430A (en) * | 2023-03-17 | 2023-04-18 | 山西富渊通科技有限公司 | Vertical active lime calcining furnace and using method thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066606A (en) * | 2015-09-05 | 2015-11-18 | 吉首大学 | Waste heat drying rotary kiln |
| CN107055535A (en) * | 2017-04-20 | 2017-08-18 | 杜金厂 | A kind of powder calcium oxide and carbon dust decompose calcium carbide device and its technique |
| CN107619203B (en) * | 2017-09-28 | 2020-06-16 | 广西华洋矿源材料有限公司 | Production method of active calcium oxide |
| CN107619203A (en) * | 2017-09-28 | 2018-01-23 | 广西华洋矿源材料有限公司 | A kind of production method of active calcium oxide |
| CN108358471A (en) * | 2018-02-26 | 2018-08-03 | 山西太钢不锈钢股份有限公司 | A method of solving the ditch group lime stone explosion of horse man |
| CN108467211A (en) * | 2018-06-19 | 2018-08-31 | 郑小华 | A kind of active lime and its production technology |
| CN110639430A (en) * | 2019-10-15 | 2020-01-03 | 宁夏洪腾科技开发有限公司 | Recarburizer granulating system for comprehensively utilizing fine powder of calcined coal furnace |
| CN110976040A (en) * | 2019-12-04 | 2020-04-10 | 句容市星辰新型材料有限公司 | Environment-friendly limestone powder production process |
| CN110976040B (en) * | 2019-12-04 | 2021-04-13 | 句容市星辰新型材料有限公司 | Environment-friendly limestone powder production process |
| CN113185152A (en) * | 2021-04-28 | 2021-07-30 | 浙江钙科机械设备有限公司 | High-quality calcium oxide grading suspension calcination production line and suspension calcination process thereof |
| CN114315179A (en) * | 2021-12-20 | 2022-04-12 | 米长山 | Process for producing active lime |
| CN114162822A (en) * | 2022-01-12 | 2022-03-11 | 米长山 | Process for producing calcium carbide |
| CN114804186A (en) * | 2022-05-16 | 2022-07-29 | 吴江市威士达铜业科技有限公司 | Production method and production device of copper oxide |
| CN115974430A (en) * | 2023-03-17 | 2023-04-18 | 山西富渊通科技有限公司 | Vertical active lime calcining furnace and using method thereof |
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| CN103880302B (en) | 2016-01-06 |
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